Planooraph co



T. H. FIELD.

STOCK CENTEREH AND CHUCK.

APPLICATION FILED MAR.26.19\8,

Patented July 1, 1919.

THE COLUMBIA PLANOGRAPH CO-, WASHINGTON. D C.

broken vieimpafrtlyiirr sectimyoi the devicesnee e ti w e ers Retail-tr BatentedlrJuly 1, 1919.

A pp lieationefiled tr rcnze, 1918} ser al e. 2e 1,.7 2e.

To all whom it may concerm.

Be it known that I, THOMAS H: liiieno, a citizen otthe UnitedStates, and resident of ArehholdQih the countyoi hulton and Stateof Ohio; have invented a eel'tailrnew and useful Stock Oenterer and Chuck; and I do hereby declare the following to bee full, clear, andexact-description of the invention, such as will enable others skilled in thecarti to which it appertainsfto make. and use the same,- reference being hadf to the accompanying drawings, and to thei characters of reference marked 1 thereon, Whichform a part ofthis specifi'catiorr.

Myqinvention relates to a means for-hold; ing cylindrical articles, While they are being operated upon by a machine or device, It particularly has for its object) to provide a centerer or chuck for. pipe threading Inachines, whereby the pipe may he held lcentrally with respect to thethread cutting dies, or While athread is-loei r'ig cuter whereby it may be gripped and held. while a threaded feed "member moves thefdies. along the end oi the pipe. Also it may. be usedlto connect a pipe threading maehine or other device with a feed screw. If desired, the form having means for grippingthepipe may be used in conjunetionvvith the for connect ihgsuch a machine With a feecl sorevv which is connected or securedto the Work by the gr pp ng de ice The invention may be eo lttainedrin struc-.

tures of different forrrrs. uselful for different purposes. I. have selected one. form of'construetion eontaihing the: invention andshall describe it. hereinafter. The. eonstruotio seleetedis. illustrated in the accompanying drawing.

Figure 1 of the. clra ingdllustrates a side.

seleeted... Fig. 2 illustrates an end. view of the deviee; Figs. ,3 and, 4 illustrate, re: SpGC-tlVQly, the side. will edge views of a dog liavingr slightly. different. constljlwti ou from. that s town in. Fig.1, Fig, .5 illustrates an applieatio-u of tl'reinventioh to screw feeding or threaded means. Figs.,6.. and 7 illustrate, l -espeetively, side. and edge views of the dogs illustrated inJFig', 6.

1, 1, is. a cylindrical shell. .thatmay, be. attaehed to or forma partof a-machine or deviee used to operate. upon eylin dricalhfld th t eentered er "clear dtythe ehuett, Tithe 111W. "Within the "and leeated are centered or securedwby the dogs 2. dogs 25 are shell. Any number of; dogs maybe used. I11 the form of construction shown three dogs are located 120? apart around the shell and iirslots 16. .The. dogs are provided with cam surfaces 4t and 5; The earn surfaces 4 and-5 formthe endsot. a cross eut through the (10%32, Theyare so formed as to Permit movement of t e e 6 having the inclined or cam,surfaces-7 'aud185 tQlllOkG along the shell 1. The shell is threadedexteriorly and The theringg 6 ist'hreaded ollto the shell 1. When the surface 105E the riiig 6 engages. theearn surface 4 of 'eaeli dog, lifts the; dog 2 out of the shell 1 a d. as. the ring 6; moved farther alpngthe shelll whenit. isrotated on the shell 1", portions of j the cam surface. u

will slide alongthe, inclined or cauu suufaee Tie surfaees. 4C arid?" anel jthe surfaces. 5 andfi are. so fiormedas to allow rotatiiqe movements of. thering 6. and yet. so. there will be contact at all times. between the pairs of surfaces Moreover,.t11e surfaces are so formed. that When the surface 7 presses eseiiist the sulf t l w s t e end, of, the dog 1 from the ce ter of. the shell 1, and when the shell: .6 is rotated. in the opposite d' ti on so as t m ve t aw y from the pivot 1 n ofthe dog, it will press against the surface 5 so as. to. force the dog into the shell to clamp With. greater or less pressure any artiele that may be located withinthe shell. The can; surface 5 being so constructed that ivheil the dog; iiiloves a short clistauee. ii to. the. shell, the inclined; rela io ,O he: eutact portions of the. surfaees 5 and 8. with refereneeqto the direction. of movement. of thedoo and the. ring will per.- mit the dog to be ti gl tlynela nped by: the re: tative, movement of; the ring 6, a

. In the. particulate construction shown, the surface fi isof sigmous tor1n,.that.is,.it has a. doublecurvature in opposite directions, While the;-surfaee 4 .1 is of single curvature and is convexin form... The; lower corner 13; of the. surface Sway be curved in order that itllltjh readily. move over a part of the earn surfaee, This is particularly of advantage when the. dogs are nearly removed from. Willlllll fihfi shell 1. Inasmuch. as the dog move the. same distances upon given move ment of the ringfi they will, occupy equal ti earl er aee ofth ehelllandeone pivoted in; ears 3 forn edon the trally withrespect to the shell 1. The surface 9 of the dogs is also preferably a curved in order that it may be tightly gripped in forcing the dogs against the object to be held, but so as to permit rotation of the shell 1 and if desired, movement of the dogs over the surface of the object that is thus held. The dogs 11, shown in Figs. 3 and 4 may be provided not only with the cam surfaces 4 and 5 but also with the teeth 12, that may be cut diagonally across the dogs in order toprevent rotative movements of the shell 1 under conditions wherein such rotative movements may occur and to prevent longitudinal movement of the object and the shell relative to each other. The diagonal teeth 12 operate to resist both longitudinal and retative movements of the object and the shell relative to each other.

The invention may also be applied to a device which is to be moved forward with reference to relative rotative' movements of a threaded member. In such a case, the dogs may be provided with threaded portions that fit the threaded member to which the shell is to be connected and with respect to which the shell is to be moved in definite relation, that is, moved with respect to the pitch of the thread of the threaded member. In the form of the structure shown in Fig. 6, the dogs 17 are provided with the threaded portions 18 having the same thread as that'found on the threaded member, such as a feed screw 14. The ring 19 may be turned so as to cause the'dog 17 to move toward the axis of the shell 20 and thethreaded member 14, a11d until the thread 18 of the dogs engage, without fitting too tightly, the thread 15 of the threaded member 14. The dogs 17 will thus engage the thread 15 at three points around the threaded member 14 and will hold the shell 20 in axial alinement with the feed screw or threaded member 14. In order 'to prevent the ring from closing the dogs 17 too tightly on the thread 15, a stop 21 may be located on the ring 19, which will strike one ofthe dogs 17 when the ring 19 is turned to bring the dogs toward the feed screw 14. The fact that the cam surfaces 4 and 50f the dogs 17 are'held at all times in the positions to which they may be lifted by the ring 19, the cam surfaces 4 and 5 being caused to slide over the surfaces 7 and 8 of the ring 19, the dogs 17 may thus be brought down upon the thread 15 and held not too tightly to cause the thread to cut, any loose play, however, being prevented by reason of the fact that the surfaces 7 and 8 fit in between the surfaces 4 and 5 at all times. Preferably, the dogs 17 are made thicker than the dogs 9 and 11 to increase the area of the threaded portions 18. Also the ring 19 and the dog 17 may be made shorter owing to the fact that very little radial movement in the dog 17 is required, while the dogs 9 and 11 may be caused to have considerable radial movement in order that the tool may be connected with different sized pipes or stock.

.The dogs 17 may be readily removed from the thread 15 by rotation of the ring 19, whereupon a machine connected to the shell 20 may be readily removed from the work to which the feed screw 14 is connected. Also the tool connected to the shell 20 may be relatively positioned with reference to the work and the feed screw 14, since the connection may be made at any point with the thread 15 by mere rotation of the ring 19.

I claim 1. In a stock centering means, a threaded shell having slots formed therein, a plurality of centering members pivoted at their ends to the shell and located in the slots, the centering members having cam surfaces extending diagonally with respect to the length of the centering members and located intermediate the free ends of the centering members and their pivots, a ring threaded on to the shell and having cam surfaces fitting between the cam surfaces of the centering members.

2. In a stock centering means, a threaded shell having slots therein, a plurality of centering members pivoted at their ends to the shell and located in the slots, a ring threaded onto the shell and having cam surfaces located at its ends, the centering members having cam surfaces located intermediate the free ends and the pivots of the centering members, one of the cam surfaces of each of the centering members located in a part extending over the ring and one of the cam surfaces of the ring the other cam surface of the ring extending over the other cam surface of the centering members.

3. In a centering means, a threaded shell having slots formed therein, a plnralit Y of centering members pivoted to the shell and located in the slots, the centering members having recesses formed in the outer edges thereof, a ring threaded onto the shell and located in the recesses, the ends of each rccess forming cam surfaces, the ring having conical surfaces coaeting with and fitting between the cam surfaces of the centering members at all positions of the centering members while the ring is operating to move the free ends of the centering members to and from the center of the shell.

4. In a centering means, a threaded shell having slots formed therein, a plurality of centering members pivoted to the shell and located in the slots, the centering members having recesses formed in the outer edges thereof, a ring threaded onto the shell and located in the recesses, the ends of each recess forming cam surfaces, the ring having conical surfaces eoacting with and fitting between the cam surfaces of the centering members at all positions of the centering members while the ring is operating to move the free ends of the centering members to Copies of this patent may be obtained for thread portions fitting the threads of the 10 screw members.

In testimony whereof I have hereunto signed my name to this specification.

THOMAS H. FIELD.

five cents each, by addressing the Commissioner of Patents, Washington, I). 0. 

